| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ufs/swab.h |
| 3 | * |
| 4 | * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org> |
| 5 | * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz> |
| 6 | * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org> |
| 7 | */ |
| 8 | |
| 9 | #ifndef _UFS_SWAB_H |
| 10 | #define _UFS_SWAB_H |
| 11 | |
| 12 | /* |
| 13 | * Notes: |
| 14 | * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes |
| 15 | * in case there are ufs implementations that have strange bytesexes, |
| 16 | * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h |
| 17 | * to support them. |
| 18 | */ |
| 19 | |
| 20 | enum { |
| 21 | BYTESEX_LE, |
| 22 | BYTESEX_BE |
| 23 | }; |
| 24 | |
| 25 | static inline u64 |
| 26 | fs64_to_cpu(struct super_block *sbp, __fs64 n) |
| 27 | { |
| 28 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 29 | return le64_to_cpu((__force __le64)n); |
| 30 | else |
| 31 | return be64_to_cpu((__force __be64)n); |
| 32 | } |
| 33 | |
| 34 | static inline __fs64 |
| 35 | cpu_to_fs64(struct super_block *sbp, u64 n) |
| 36 | { |
| 37 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 38 | return (__force __fs64)cpu_to_le64(n); |
| 39 | else |
| 40 | return (__force __fs64)cpu_to_be64(n); |
| 41 | } |
| 42 | |
| 43 | static __inline u32 |
| 44 | fs64_add(struct super_block *sbp, u32 *n, int d) |
| 45 | { |
| 46 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 47 | return *n = cpu_to_le64(le64_to_cpu(*n)+d); |
| 48 | else |
| 49 | return *n = cpu_to_be64(be64_to_cpu(*n)+d); |
| 50 | } |
| 51 | |
| 52 | static __inline u32 |
| 53 | fs64_sub(struct super_block *sbp, u32 *n, int d) |
| 54 | { |
| 55 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 56 | return *n = cpu_to_le64(le64_to_cpu(*n)-d); |
| 57 | else |
| 58 | return *n = cpu_to_be64(be64_to_cpu(*n)-d); |
| 59 | } |
| 60 | |
| 61 | static __inline u32 |
| 62 | fs32_to_cpu(struct super_block *sbp, __fs32 n) |
| 63 | { |
| 64 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 65 | return le32_to_cpu((__force __le32)n); |
| 66 | else |
| 67 | return be32_to_cpu((__force __be32)n); |
| 68 | } |
| 69 | |
| 70 | static inline __fs32 |
| 71 | cpu_to_fs32(struct super_block *sbp, u32 n) |
| 72 | { |
| 73 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 74 | return (__force __fs32)cpu_to_le32(n); |
| 75 | else |
| 76 | return (__force __fs32)cpu_to_be32(n); |
| 77 | } |
| 78 | |
| 79 | static inline void |
| 80 | fs32_add(struct super_block *sbp, __fs32 *n, int d) |
| 81 | { |
| 82 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 83 | *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)+d); |
| 84 | else |
| 85 | *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)+d); |
| 86 | } |
| 87 | |
| 88 | static inline void |
| 89 | fs32_sub(struct super_block *sbp, __fs32 *n, int d) |
| 90 | { |
| 91 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 92 | *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)-d); |
| 93 | else |
| 94 | *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)-d); |
| 95 | } |
| 96 | |
| 97 | static inline u16 |
| 98 | fs16_to_cpu(struct super_block *sbp, __fs16 n) |
| 99 | { |
| 100 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 101 | return le16_to_cpu((__force __le16)n); |
| 102 | else |
| 103 | return be16_to_cpu((__force __be16)n); |
| 104 | } |
| 105 | |
| 106 | static inline __fs16 |
| 107 | cpu_to_fs16(struct super_block *sbp, u16 n) |
| 108 | { |
| 109 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 110 | return (__force __fs16)cpu_to_le16(n); |
| 111 | else |
| 112 | return (__force __fs16)cpu_to_be16(n); |
| 113 | } |
| 114 | |
| 115 | static inline void |
| 116 | fs16_add(struct super_block *sbp, __fs16 *n, int d) |
| 117 | { |
| 118 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 119 | *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d); |
| 120 | else |
| 121 | *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d); |
| 122 | } |
| 123 | |
| 124 | static inline void |
| 125 | fs16_sub(struct super_block *sbp, __fs16 *n, int d) |
| 126 | { |
| 127 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
| 128 | *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)-d); |
| 129 | else |
| 130 | *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)-d); |
| 131 | } |
| 132 | |
| 133 | #endif /* _UFS_SWAB_H */ |